Pump-controlling mechanism



Jan. 5 1926. 1,568,500

R. CONRADER PUMP CONTROLLING MECHANI SM Filed Sept. 12. 1925 3Sheets-Sheet 1 Jan. 5 1926.

R. CONRADER PUMP CONTROLLING MECHANISM Filed Sept. 12. 1925 3Sheets-Sheet 2 m 3 W; &

7 \s mi Qgq m g -m rn 4 v "-MIiliiib 4 Jan. 5 1926.

R. CONRADER PUMP CONTROLLING MECHANISM Filed Sept. 12. 1923 3Sheets-Sheet 5 7 u a zz Patented Jan. 5, 1928.

UNITED STATES RUDOLPH connannn, on mun, rnNNsYLvANiA.

PU'KP-CONTROLLING MECHANISM.

Application filed September 12, 1923. Serial No. 662,200.

Toall 'whomit may concern:

Be it known that I, RUDOLPH CONRADER,

driving the pump, 9 an air pump for creatmg suction, 10 an auxiliarymotor driving a citizen of the United States, residing at, the air pump,and'll a connecting pipe Erie, in the county of Erie and State of leadmgfrom the suction pump to the cen- Pennsylvania, haveinvented new anduseful Improvements in Pum Controlling Mechanism, of which the fol owingis a speci-fic a tion.

It is desirable to automatically control rotary pumps so as to maintaina desired liquid level. It is particularly desirable in* pumpingminesand as illustrated the invention is so applied. With a rotary pumpit is necessary to prime the pump and this is isually accomplished bysubjecting the pump to -suction which drawsinto the pump a suflicientamount of liquid to start the pump. here this is done it is desirable torevent the liquid reaching the pump producing the suction priming effortand it is also desirable to-havethe sequence of operations in properrelation. In the. present" invention the suction pressure is utilized asa factor of control and this is related to liquid level actuatedcontrolling devices and also may be related to a liquid pressurecontrolling. device and a speed responsive controlling means. Theinvention relates to these several features as well asothers which willappear from the specificationand claims.

The invention is illustrated in the accompanying drawings as followsFig. 1 shows a diagrammatical view of the apparatus.

Fig. 2a sectional view of the speed responsive mechanism.

Fig. 3 a main electric switch actuating motor.

Fig. 4 a side elevation, partly in section, of the liquid level controlswitches.

Fig. 5 a sectional view of a retarding'ie striction in one of thecontrolling conduits.

Fig. 6 is a sectional view of a float-com,

trolled closure for the suction line.

Fig. 7 a'sectionon the line 77 in Fig. 6.

Fig. 8 a sectional view of a switch con- .trolling mechanism subjectedto suction eflt'ort andliquidpressure effort. a

1 marks a mine sump, 2 a centrifugal pump which as shown is a two stagepump, ,3 the intake to the pump, 4 the discharge leading from the pump,5 the intake pipe leading from-,the sum to the intake 3, 6 a check valvein the discharge 4, 7 a rotor shaft for the pump, 8 a main electricmotor trifugal pump. So far these parts may be of ordinary construction.j

A float 12 follows the liquid level in the sump. It is. slidably mountedon a rod 13 and engages shoulders 14 at the maximum and minimum levelsbetween which it is desired to control the liquid level at X. A shoulder15 is arranged on the rod 13 and en ages a. switch lever 16, the rod 13extending t rough this lever. The lever 16 is pivoted at 17 on a piston18. The outer end of the lever engages a bell crank switch lever 19pivoted at 20 and mounted'on a bracket 21. The bell crank lever 19carries the contact points 22 which as the lever is swung engage points23, thus completing a switch in the circuit controlling the auxiliarymotor 10. Line wires 24, 25 and 26 are provided in the usual manner anda wire 27 extends from the line 26 and is controlled by the switchhaving the contacts 22 and 23. The wire 27 leads to the-auxiliary motor10 anda wire 28 leads from the auxiliary motor to the line wire 25 ofthe supply line. It will readily be seen that as the liquid level Xrises to the predetermined point the float 12, through the lever 16 andlever 19, will close the contacts 22 and 23 thereby completing thecircuit in the line 27 and starting the motor 10.

Arranged in the line between the pipe 11 and the 'pum 2 is a. floatchamber 29 and this is connecte by branch pipes 30 and 31 with the twochambers of the pum 2, a check valve 32 being provided in the ranch 30or low pressure side to prevent a disturbance in the action of the pump2 after priming.

A float 33 is arranged in the float chamber 29. A valve 34openatesagainst a seat 35, the valve being gulded by a stem 36 operating througha spider 37. The float 33 is made of glass to prevent corrosion and theweight of the float when the chamber 29 is free from liquid issufficient to hold the valve 34 off its seat. When the suction ump 9 isstarted with thesystem free from quid the suction effort is deliveredthrough the float chamber 29 to the centrifugal pump chambers drawingthe liquid from the sump to the pump 2, the check valve 6 preventingaback-flow of air or liquid through the discharge. -\Vhen the liquidreaches the float chamber it operates on the float. Asthe float risesthe stem 36 isreleased from the pressure of the float and a spring 38operating against a collar: 39 at its upper end and against the spider37 at its lower end, closes the valve 34, thus preventing the li uidfrom reaching the suction pump. A ter the pump 2 is startedthe valve 34is subjected to pressure and maintains it in place, thus forming a'closure during the normal operation of the pump. If there is any leakagepast the valve 34 into the float chamber 29 it is discharged by way of"the pipe 40, this pipe being provided; with a check valve 41 nearlybalanced so as 'todischarge any liquid that may leak through the valve34 and yet be instantly closed as against any inlet of air throughthesuction effort.

A pipe 42 extends from the pipe 11 to a cylinder 43, this cylinderhaving an inlet the contact" 60 and 61.

opening 4 t from which the ports 45 and 46 lead to the cylinder. Adischarge passage 47 is-connected by .a port 48 with the cylinder, andthe cylinder isconne'cted by a port 49 with the atmosphere. A plungervalve 50 operates in the cylinder. This has the annular way 51 around itand the valve isheld normally in its upper position by a spring 52. Thespring-52' is of sufiicien't strength to prevent the movement of theplunger 50 prior to thegclosing of the valve -34-in other words, thesuction effort is relieved by the. lifting of the'liquid into the.centrifugal pump and its passages and itis only after the closing of thevalve 34 and the added suction efi'ort caused there that the plunger 50moves. In order to adjust-the tension .onthe spring 52 to the desiredsuction efi'ort necessary to lift the liquid into the centrifugal pumpand its passage an adjusting screw 53 is pro 'ided." This is locked inposition by a nut 54.

When the plunger 50 has been subjected to the predetermined suctioneffort through its connection by way ofthe ports 4546- it immediatelymoves downwardly 'connecting.

the port 45 with the port 48 and closing off the port 49. The suctionthen. is communicated to the passage 47.

A .rod 55 extends upwardly from the plunger 50 and is provided with a.slot 56 th ough which a switch lever 57 extends. The switch lever ispivoted at 58 on a braclret59 and has the contacts 60 adapted to engageswitch contacts 61. A spring 62 normally holds the contacts 60 and 61 inopen position. When the plunger 50 moves downwardly due to the suctioneffort below it the rod 55 moves downwardly with it and draws the lever57 down so as to close It will readily be seen, therefore, that as thesuction efiort moves the plunger. 50, the contacts 60-and 61 are closed.

A pipe 63 leads from the discharge assage 47 to a pipe 64 which isconnecte' to a cylinder 65 by a port 66. A valve plunger 67 is mountedin the cylinder. This plunger is normally held to the left by a spring68. It has two annular ways 69-70. The way 69 connects the port 66 witha 'port 71 leading to a passage 72 connected with a pipe 73. The pipe 73leads to a cylinder 74.

rod 76' leads from the piston to a conin which there is a plunger orpiston 75. A

trol. arm 77 of a starting switch mec'htanism 78, the control armbeing'shown in Fig. 3 in neutral'position and adapted to that as soon asthe suction efl'oithas moved the plunger 50 and air is passed throughthepipe 63 and by the way 69 of the plunger 68 to the pipe 73, the piston75 is drawn forward through the reduction in pressure in front of thepiston throwing the arm 77 V to the starting position 79, therebystarting the main motor 8,and the pump 2.

As soon as the pump 2 is started and creates liquid pressure'it isdesirable to lockthe switch contacts 6(;) .'f'61 in closed positionbefplaced' at normal starting position at 79 so that the priming "motoror suction pump may be stopped. To this end a pipe 84 leads from thebranch 3i at the pump 2 to a cylinder '85. A piston 86 is arranged inthe cylinder 85. A rod 87 extends downwardly from the piston 86' and hasthe slot- 88 through which the switch lever 57 extends.

This slot permits the moving downwardly of the lever through theactionof the plunger 50 but after a liquid pressure is created the piston 86is forced downwardly thus locking the lever 57 inits lower position eventhough the plunger 50 returns to its normal or upper position, the slot56 per mitting the upward movement of the plunger 50 with the lever 57held in its lower position bythe rod 87. P

After the driving motor 8 is started and -reaches a pre-determined speedit is desirable to throw the control arm 77 of the switch 78 from thestarting position at 7 9 to its normal running position at 80. Thisshould only be done after the motor 8 has reached its pre-determined ordesired speed. This is accomplished in the present structure as.

follows :'A pulley 89 is fixed on an 'extension of the shaft 7. A belt90 extends from the ,pulley 89 to a pulley 91 on a speed sensitivedevice. The pulley 91 is keyed on a sleeve 91 journaled in a bracket 92.Governing weights 93 are pivoted on ahead 91 on the end of the sleeve91. The weights are connected with across head 94 on a stem 94 by links91% A spring 94 forms a centripetal element opposing the centrifugalforce of the wei hts 93. As the speed builds up and the weights openacting through the linkage the stem 91 is operated and this contacts aush rod 95 which operates on a valve 96 in t 1e cylinder 65. Ports 97connect the inlet opening 64 with a chamber 98 and the chamber 98communicates with the cyllnder 65 when the valve 96 is opened. As soon,therefore, as the valve 96 is opened through the action of the speedsensitive device the plunger 67 is subjected to the suction effort andis immediately moved to the right, opening the port 71 tot-he atmosphereand connecting t e port 66 with the port 99. The cylinder is connectedthrough the port 99 with a'pipe 100. The pipe 100 leads to the. cylinder74 at the opposite side of the piston 75 from the pi e 73. As soon asthe suction effort is out o from the left of the piston 75 and acts fromthe right of the piston 75, the piston immediately moves to the ri htcarrying with it the control arm 77 am? throwing the switch 78 to thenormal running position. The'control arm 77 is locked or held in normalrunning position by the usual magnet 101 operating through c the linka e102 (not shown).

opened the suction pump 9 stops and the After t e motor 8 has beenbrought to its desired s eed and the control switch 78 has been shi edto its normal running position it is desirable to stop the suction pump9. This is accom lished as follows :A pipe 103 connects the pipe 100with a cylinder 104. The piston 18 is arranged in the cylinder 104 andwhen the pipe 100 is connected with the suction effort of the primingpump 9 in the manner above described the cylinder 104 is also connectedand the piston 18 is drawn to the left, thus disengag mg the lever 16from the bell crank lever 19 and permitting the switch contacts 22 23 toseparate through the action of the spring 105 operating'on the lever 19.The lever 16 has a yielding end 106 slidingly mounted in the end of thelever and retained normally in its outer osition by a spring 107. Thispermits the dropping of the lever 16 past the lever 19 as theshoulder'15 is lowered with the lowering of the liquid level. It will readily beseen, therefore, that as the suction'efiort moves the piston 18 to theleft disengaging the levers 16 and 19 that the switch contacts 22-23 areopened breaking the circuit in the line 27 and stopping the motor 10 andsuction pump 9. Immediately the switch contacts 22-23 are suction effortis, therefore, relieved throughout the mechanism. As a result of thisthe plunger 50 returns to its original position as shown in Fig. 8. Theplunger 68 also re- Y turns to its normal position carrying the lever 16into position to engage the lever 19- when the liquid level rises to thepre-' determined point. In order to retard the breaking of the switchcontacts 2223 controlling the suction pump 9 slightly until theoperating arm 77 of the main control switch '78 has been thrown to placethe switch 78 in normal running position a restriction 108 is arrangedin the pipe 103 so that there is ample time for the throwing of theswitch arm 77 prior to the breaking ofthe connection 2223.

With the parts as now indicated the pump 2 continues to act until thewater level X reaches the predetermined low level when the float 12engages the lower shoulder 14. At this point the rod 13 is drawndownwardly and the shoulder 109 contacts :1 switch lever 110. The switchlever 110 has thecontacts 111 adapted to engage contacts 112. Thisswitch lever is pivotally mounted on a bracket 113 and is normallyheldin closed position by a spring 114. It will be seen, therefore, that asthe float 12 engages the lower shoulder 14 carrying the rod .13downwardly the shoulder109 operating on the lever 110 opens the contacts111112 stopping the main motor 8 and the pump 2 as willabe hereinafter.explained. Immediately the contacts 111-112 are opened and the mainmotor 2 stops the weights 93 of the speed sensitive device assume theirnormal position drawing the stem 94- to the right and allowing the valve96 to close through the action of the spring 68. The release of theliquid pressure on the connection 84 permits the piston 86 to return toits upper position and, therefore, opening the contacts 6061. Thewithdrawal of pressure under the valve 34 permits the float 12 to fallas the liquidof the pump 2 returns down the inlet pipe 5. A small vent29 is provided leading to the float chamber 29 permitting it to receiveatmospheric pressure as soon as the suction pump 9 stops. This vent isso small as not to interfere with. theordinary suction effort andprovides a simple .man-

ner of restoring the pressure in this line. Thus all parts are broughtto the initial position an ready for a subsequent operation when theliquid level again rises.

' It is also desirable in pumps of this type that some means he providedto stop the motor 8 and pump 2 should the pump 2 lose its supply ofliquid, or as is more commonly termed its suction, such as might happenfrom a leak or break in the supply pipe 5 or intake 3. This safety meansis provided in the present structure through the cylinder 85. Should thepump 2 lose its liquid sup-' ply for any reason and cease to force aliquid pressure on the piston 86 the piston would bemoved upwardly bythe spring 115. In order that the piston 80 may move upwardly .at adesired pre-determined pressure the spring 115 is tensioned by anadjusting .screw 116 which is locked in position by a nut 116. Themagnet 101 which holds the control arm 77 in normal running position isWired in series with the switch having contacts 60-61 and with theswitch having contacts 111-.112. through the shunt wire 117. It willreadily be seen, therefore, that as the contacts 6061 are opened due tothe action of the spring 115 against the piston 86, rod 87 and lever 57that the circuit in the shunt line 117 is broken thereby deenergizingthe magnet 101 and allowing the control arm 77 to swing to neutralposition due to the action of the spring 118 as shown in Fig. 3.Thecontacts 1-1l-112 are nor-' mally held in closed position by thespring 114. When the float is lowered by the water level X the shoulder109 engaging the lever 110 opens the contacts T11 112 thereby breakingthe circuit in the line 117 in? which the magnet 101 is wired allowingthe spring 4} 118 to throw the control arm 77 into neutral position andstopping the main motor 8 and centrifugal pump 2.

While I have shown the apparatus as exhausting the liquid from a sumpand the pump he-re starts on a high level dtliquid it will readily beunderstood that this condition may be reversed where it is desired todeliver the liquid to a reservoir and maintain the desired level in thereservoir.

What I claim as new is 1. In a pump controlling mechanism, the

.combination of a rotary pump; a motor the connection is closed.

. 3. In a pump controlling mechanism, the

combination of a rotary pump; a motor driving said pump; mechanismcontrolling said motor; a suction priming means con-. nected to therotary pump; devices closing the connection at the completion of thepriming of the rotary pump comprising a float-controlled valve; andmeans actuated by the suction pressure controlling said ing the rotarypump.

5. In a pump controlling mechansim, the combination of a rotary pump; asuction priming pump connected to the rotary pump; and controllingmechanisms for said pumps comprising means actuated by the suctionpressure of .the suction pump starting the rotary pump and stopping thesuction pump.

6. In a pump controlling mechanism, the combination 0 a rotary pump; asuction priming pump connected to the rotary pump; and controllingmechanisms for said pumps comprising means actuated by a "liquidlevelstarting the suction pump and actuated by suction pressure from thesuction pump to start the rotary pump.

7. In a pump controlling mechanism, the combination of a rotary pump; asuction priming pump connected to the rotary pump; and controllingmechanisms for said pumps comprising means actuated by a liquid levelstarting the suction pump and actuated by suction pressure from thesuction pump to start the rotary pump and stop the suction pump.

8. In a pum controlling mechanism, the combinationo a rotary pump; asuction priming pump connected to the rotary pump and controllingmechanisms for said pumps comprising means actuated by a liquid levelstartingthe suction pump and actuated by suction pressure from thesuction pump to start the rotary pum and actuated by a liquid levelstopping t e rotary pump.

9. In a pum ,eontrolling mechanism, the combination 0 a rotary pump; asuction priming pump connected to the rotary pump; and'controllingmechanisms for said pumps comprising means actuated by a liquid levelstarting the suction pump and actuated by suction pressure from thesuction pump to start the rotary pump and stop the suction pump andactuated by a liquid level stopping the rotary pump.

10. In a pump controlling mechanism, the combination of a rotary pump; asuction priming pump connected to the rotary pump; and controllingmechanisms for said pumps comprising means actuated by the suctionpressure of the suction pump starting the rotary pump and stopping thesuction pump, the means stopping the suction pump being speed responsiveto the rotary 11. In a pump controlhng mechanism,

the combination of a rotary'pump; a motor .driving said pump; mechanismcontrolling said motor, said mechanism havinga startnormal runningposition; a suction priming pump connected to the rotary pump; and fluidpressure actuated means controlling said mechanism.

12. In a pump controlling mechanism, the combination of a rotary pump; amotor driving sai'd pump; mechanism controlling said motor, saidmechanism having a startin normal running position; a suction primingpump connected to the rotary pump; and fluid pressure actuated meansresponsive to the action of the suctionpump controlling said mechanism.

13. In a ump controlling mechanism,- the combination of a rotary pump;aimotor driving said pump; mechanism controlling said motor; fluidSpressure actuated means controlling said mechanism; a suction-primingpump connected .to the rotary -pump; and controlling devices startingthe suction pump acting through said means starting the rotary pump andthen stopping the suction pump.

14. In apum controlling mechanism, the,

a rotary pump; a motor driving said ump; mechanism controlling saidmotor; Enid pressure actuated means controlling said mechanism; asuction priming pump connected to the'rotary pump; and controllingdevices starting the suct on pump acting through said means starting therotary pump and then stopping the suction pump, said devices comprisingmechacombination 0 nism responsiveto the speed of the rotary.

um p 15? In a pump controlling mechanism, the combination of a rotarypump; a suction priming pump; and controlling mechanism com risingdevices responsive to thespeed of t e rotary pump'stopping the suction PP- I 16. In a pump controlling mechanism, the. combination of a rotarypump; a suction priming pump; and controlling mechanism comprising aliquid level device for starting the priming pump, a fluid actuated.device responsive to suction efi'ort of-the suction pump starting therotary pump, and speed responsive devices responsive to the speed of therotary pump stopping the suction pump. 1 7 In a pump controllingmechanism, the

combination-of a rotary pump; a suction.

priming pump; and controlling mechanism comprising a liquid level devicefor starting the priming pump, a fluid actuated device responsive tosuction efiort of the suction pump starting the rotary pump, speedresponsive devices responsive to the speed of the rotary pump stoppingthe suction pump, and liquid'level actuated devices stopping the rotarypump..

18. In a pump controlling mechanism, the

trio motor driving said combination of a rotary pump; a sudden primingpump; and controlling mechanism comprising a liquid leveldevice forstarting the priming pump, a fluid actuated device responsive to suctioneffort of; the suction pump starting the rotary pump, speed responsivedevices responsive to the speed of the rotary pump stopping the suctionpump,

and apumped liquid pressure actuated 'device for stopping the rotarypump.

'19. In a pump controlling mechamsm, the combination of a rotary pump; asuctionpriming pump; and controlling mechanism compr sing a liquid leveldevice for starting the priming pump, a fluid actuated device responsiveto suction" effort of the suction pump starting-the rotary pump, speedre.-

sponsive devices responsive to the speed of the rotary pum sto in thesuction um and .liquid leve and gum ped liquid pr ssui'g devicesstopping the rotary pump.

-20; .In a. pump controlling mechanism, the combination of a rotarypump; a main electric: motordriving' said (pump; a'suction priming pumpconnecte to the rotary pump; anauxiliary electric motor driving thesuction pump; a liquid level controlled circuit for the auxiliary motora secondary circuit for the mam motor; and devices controlling thesecondary circuit controlled by fluid pressure from said pumps.

21. In a pump controlling mechanism, the" combination of a rotary pump;a main electric motor driving said pump; a suction priming pumpconnected to the rotary.

pump; an auxiliary electric motordriving the suction pump; aliquid levelcontrolled circuit 'for the main motor; and devices controlling thesecondary circuit controlled by suction pressure from the suction pump.

ioo

, circuit for the auxiliary motor; a secondary 22.- In a pumpcontrolling mechanism, the

combination of a rotary. pump; a mainelec- (pump; a suction priming pumpconnecte pump; an auxiliary electric motor .driving the suction ump; aliquid level controlled circuit for the auxiliary motor starting-saidmotor; a secondary circuit for the main'mo-,

switch having a starting and normal running position for the main motor;and fluid actuated means controlled by said pumps for actuating saidswitch to start the main motor in sequence with the auxiliary motor.

to the rotary y,

24, In a rotary pump, the combination of a main electric motor drivingsaid pump; a"

and fluid actuated means controlling the switch to start the main motorfor closing the connection.

25.11] a rotary pump, the combination of a main electric motor drivingsaid 'pump; a

suction priming pump connected to the rotary pump; an auxiliary electricmotor driving the suction pump; a liquid level controlled circuit forthe auxiliary motor; means for closing the connection between thepriming pump and the rotary pump; a secondary circuit for the mainmotor; a switch controlling the secondary circuit; and fluid actuatedmeans controlling the switch to start the main motor for closing theconnection, comprising speed responsivemechanism responsive to the speedof the rotary pump.

26. In a pump controlling mechanism; the combination of a rotary pump; asuctlon priming pump; a main motor driving the rotary pump; an auxiliarmotor driving the suction pump; an auxiliary circuit for the auxiliarymotor; an auxiliary circuit switch controlling saidicircuit; a floatdevice closing said switch; and a pressureactuated device for openingsaid switcln 27. In a pump controlling mechanism, the combination of arotary pump; a suction priming pump; a main motor driving the rotarypump; an auxiliary motor driving the suction pump; an auxiliary circuitfor the auxiliary motor; an auxiliary circuit switch controlling saidcircuit; a float device closing said switch; and a pressure actuateddevice for opening said switch, said pressure actuated device beingsubjected to the suction effort of the suction motor.

28. In a pump controlling mechanism, the combination of a rotary pump; asuction priming pump; a main motor driving the rotary pump; an auxiliarymotor driving the suction pump; an auxiliary circuit for the auxiliarymotor; an auxiliary circuit switch controlling said circuit; a floatdevice closing said switch; and a pressure actuated device for o eningsaid switch, said pressure actuate device being subjected to the suctioneffort of the suction motor and comprising engaging levers, one of whichis mounted -on the movable element of the device subjected to thesuction Lucaooo 29. In a pump controlling mechanism, the combination ofa rotary pump; a suction pump; a motor driving the rotary pump; acircuit controlling the motor; a switch in the circuit; a pressuredevice actuated by the suction eifort of the suction pump closing theswitch; and a pressure device responsive to liquid pressure of pumpedliquid acting on the switch, said devices being operative independentlyto close the switch.

30. In a pump controlling mechanism, the combination of a rotary pump; asuction pump; a motor'driving the rotary pump; a circuit controlling themotor; a switch in the circuit; a pressure device actuated by thesuction effort of the suction pump closing the switch; a pressure deviceresponsive to liquid pressure of pumped liquid acting on the switch,said devices being operative independently to close the switch: andmeans for relieving the suction efi'ort actuated device after thepriming action.

31. In a pump cont-rolling mechanism, the combination of a rotary pump;a motor driving said pump; a" circuit controlling the motor; and devicesfor opening the circuit comprising a liquid level actuated mechanism anda pumped liquid pressure actuated mechanism whereby said motor isstopped either by a predetermined level of liquid or a breaking of theliquid column leading to the pump.

32. In a pump controlling mechanism, the combination of a main pump; amotor driving said pump; starting mechanism for said pump; and anauxiliary pump controlling said starting mechanism;

33. In a pump controlling mechanism, the combination of a main pump; amotor driving said pump; starting mechanism for said pump; an auxiliarypump controlling said starting mechanism; and liquid level controlledmeans controlling the auxiliary pump. I

34. In a pump controlling mechanism, the combination of a main pump; amotor driving said pump; starting mechanism for said pump; an auxiliarypump controlling said starting mechanism; and means responsive to theaction of the main pump stopping the auxiliary pump.

35. In a pump controlling mechanism, the combination of a main pump; amotor driving said pump; starting mechanism for said pump; an auxiliarypump controlling said starting mechanism; and means responsive to theaction of the main pump stopping the auxiliary pump, said meanscomprising devices responsive to the'speed of the main pump.

36. In a pump controlling mechanism, the combination of a main pump; amotor driving said pump; startingmechanism for said pump; an auxiliarypump controlling said starting mechanism; and means controlled by thepumped fluid from the main pump sto ing the auxiliary pump.

3%. In a pump controlling mechanism, the combination of a main pump; amotor driving said pump; starting mechanism for said pump; an auxiliarypump controlling said startin mechanism; and means responsive to conitions of the main pump and actuated by pressure from the auxiliary pumpstopping the auxiliary pump.

38. In a pump contro ling mechanism, the combination of a main pump; amotor driving said pump; means for supplying fluid under pressure;mechanism controlling said sup led from said means controlling said mecanism.

39. In a pump'oontrolling mechanism, the combination of a main pump; amotor driving said pump; an auxiliary pump; mechanism controlling saidmotor; and devices actuated by the pumped fluid of the auxiliary umpactuating said mechanism.

40. n a pump controlling mechanism, the combination of a main pump; amotor driving said pump; an auxiliary pump; mechanism controlling saidmotor; and devices actuated by the pumped fluid of the auxiliary pumpactuating said mechanism, said devices comprising means responsive tothe speed of the main pump 41. In a pump contro combination of a mainpump; a motor driving said pump; mechanism controlling said motor; fluidactuated means controlling said mechanism; an auxiliary pump supplyingsaid fluid; and controlling devices starting the auxiliary pump"andacting through said and fluid'pressure actuated devices mechanism,an auxiliary ling mechanism, they means starting the motor and thenstopping the auxiliary pump.

42. In a pump controlling mechanism, the combination of a main pump; amotor driving said ump; mechanism controlling said motor; uid actuatedmeans controlling said mechanism; an auxiliary pump supplying saidfluid; and controlling devices starting the auxiliary pump and actinthrough said means starting the motor an then stopping the auxiliarypump, said devices comprising mechanism responsive to the speed of themain pump.

43. In a pump controlling mechanism, the combinationpf a main pump; amotor driving said pump; mechanism controlling said motor; fluidactuated means controlling said mechanism; an auxiliary pump supplyingsaid fluid; and controlling devices starting the auxiliary pump andacting through said means starting the motor and then stopping theauxiliary pump, said devices comprising mechanism responsive to liquidlevels.

44. In a pump controlling mechanism, the combination of a main pump; amotor driving said pump; mechanism controlling said motor; fluidactuated means controlling said pump supplying said fluid; andcontrolling devices starting the auxiliary pump and acting through saidmeans starting the motor and then stopping the auxiliary pump, saiddevices comprising mechanism responsive to liquid levels and to thespeed of the main pum In testimony whereof I my hand.

have hereunto set RUDOLPH CONRADER.

